but critics think chris christie' weight is a big obstacle. >> but now christie is saying hey, enough is enough. with more on this, here's abc's dan harris. >> this is just another hack who wants five minutes on tv. >> reporter: chris christie displaying his famous candor, reacting to dr. connie mariano, who called the governor a time bomb. >> i'm a physician more than a democrat or republican and i worry about this man dying in office. >> reporter: the governor questioned how she could diagnose him from her office in arizona. >> it's completely irresponsible. my 12-year-old son said dad, are you going to day? >> hey, bring it fat boy. >> chris christie said he's not going to run for re-election next year. he's like, i'll collapse that bridge when i get to it. >> reporter: his weight has been constant source of attention. he insists his held is still good, but he's aware his weight could become a serious issue, and that he has a plan to deal with it. when you look at him, do you think he's a ticking time bomb? >> i think it's really very judgmental to have such a strong conviction whe